EP1365120B1 - Acoustic transducer for motor vehicle - Google Patents

Acoustic transducer for motor vehicle Download PDF

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Publication number
EP1365120B1
EP1365120B1 EP03010875A EP03010875A EP1365120B1 EP 1365120 B1 EP1365120 B1 EP 1365120B1 EP 03010875 A EP03010875 A EP 03010875A EP 03010875 A EP03010875 A EP 03010875A EP 1365120 B1 EP1365120 B1 EP 1365120B1
Authority
EP
European Patent Office
Prior art keywords
acoustic transducer
transducer according
vibrating body
chamber
transmission body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03010875A
Other languages
German (de)
French (fr)
Other versions
EP1365120A1 (en
Inventor
Andreas Enderich
Lutz Fröhlich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle Filtersysteme GmbH
Original Assignee
Mahle Filtersysteme GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mahle Filtersysteme GmbH filed Critical Mahle Filtersysteme GmbH
Publication of EP1365120A1 publication Critical patent/EP1365120A1/en
Application granted granted Critical
Publication of EP1365120B1 publication Critical patent/EP1365120B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/22—Silencing apparatus characterised by method of silencing by using movable parts the parts being resilient walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1222—Flow throttling or guiding by using adjustable or movable elements, e.g. valves, membranes, bellows, expanding or shrinking elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1294—Amplifying, modulating, tuning or transmitting sound, e.g. directing sound to the passenger cabin; Sound modulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/14—Combined air cleaners and silencers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/22—Methods or devices for transmitting, conducting or directing sound for conducting sound through hollow pipes, e.g. speaking tubes
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/02—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated
    • G10K9/04—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated by compressed gases, e.g. compressed air

Definitions

  • the present invention relates to a sound transducer for a motor vehicle having the features of the preamble of the claim 1.
  • Such a transducer is for example from the DE 199 22 216 A1 and has a hollow transfer body, the at his entrance to the extraction of airborne sound connected to a fresh air line, the fresh air too an internal combustion engine of the vehicle leads.
  • This Transmission body is a modulated airborne sound at one Output of the transmission body to an interior of the vehicle radiated.
  • the decoupled airborne sound has the transfer body a serving as a vibrating body membrane made of plastic or rubber, due to the decoupled airborne sound is excitable to vibrations.
  • the generated vibrating diaphragm the modulated airborne sound and radiates this to the output of the transmission body.
  • Size, texture, mass and texture of the membrane can affect the modulation of the decoupled airborne sound so as to have a desired modulated airborne sound to be able to radiate.
  • a further sound transducer is the initially known type, wherein the transmission body for the extraction of airborne sound with its input to a Exhaust pipe of the internal combustion engine is connected.
  • the modulation of the decoupled airborne sound also occurs here with the help of a membrane that stimulates to vibrate is and at the output of the transmission body modulated Airborne sound, e.g. radiates into an engine compartment.
  • the transfer body must be sealed gas-tight be to exhaust passage in the engine compartment too prevent.
  • the gas-tight closure of the transmission body takes place here again through the membrane, so that on the membrane on the one hand the exhaust pressure prevails, while on the other hand essentially the ambient pressure is applied. Because the exhaust pressure during operation of the internal combustion engine relatively strong Is subject to fluctuations and regularly significantly above the ambient pressure, the above-described Problems also occur here because the membrane due the pressure difference bulges and tense. The accompanying Change in the radiation characteristic is undesirable.
  • the present invention deals with the problem for an acoustic transducer of the type mentioned an improved Specify embodiment, in particular the Dependence of pressure changes at the entrance of the transfer body is reduced.
  • the present invention is based on the general idea Instead of a flexible membrane a rigid or To use stiff vibrating body, with the help of a bracket is held vibratory, this holder against spring force in the vibration direction of the vibrating body is adjustable.
  • this construction is achieved that low - frequency pressure fluctuations in the input area of Transmission body by appropriate relative adjustments the holder together with the vibrating body held by it can be compensated by the holder so far adjusted until the spring force establishes a balance.
  • the low-frequency pressure fluctuations in the respective Sound source usually does not move in one audible frequency spectrum. Accordingly, they can only an adjustment of the relative position of the vibrating body reach, without this for the delivery of an audible sound radiation to stimulate.
  • the decoupled higher-frequency airborne sound the vibrating body after to excite vibrations that cause a radiation of audible, caused modulated airborne sound.
  • the decoupled from Airborne noise at the vibrating body are excitable amplitudes essentially independent of the deflection of the holder, so that the vibration characteristic of the vibrating body essentially independent of the audible frequency range from that at the input side of the transmission body is prevailing pressure.
  • transducer can thus from a fresh air line or from an exhaust pipe one Internal combustion engine independent of pressure fluctuations, the during operation of the internal combustion engine in the fresh air line or occur in the exhaust pipe, airborne sound decoupled and with a substantially constant remaining Modulation behavior of the oscillating body in modulated Airborne sound to be converted.
  • the holder as Corrugated pipe made of metal or as a bellows made of plastic or Be formed rubber, said corrugated pipe or the bellows at one end has the oscillating body and at the other end attached to the transfer body.
  • a corrugated pipe and a Bellows can be made relatively inexpensive and as well be formed so that they act simultaneously as a spring and due to the internal elasticity always a defined Seek to take starting position.
  • the transmission body in a range of relatively low temperatures is connected to the sound wave.
  • the Transfer body to an intake manifold of an internal combustion engine connected.
  • the metal-corrugated tube holder is preferred.
  • the respective, portion of the transmission body connected to the sound source made of metal (hot area) or plastic (cold area) made.
  • the vibrating body is made of a heat-resistant Material, e.g. made of metal, glass or ceramic, made and attached to the metal corrugated pipe.
  • the transmission body can a Have chamber, wherein the vibrating body at the entrance or at the exit of this chamber or between entry and exit is arranged.
  • this chamber is called Resonatorhunt trained to thereby specifically decoupled Airborne sound to excite the oscillating body and / or the to modulate airborne sound emitted by the oscillating body. For example, certain frequencies or frequency bands be amplified while other frequencies or frequency bands to be dampened or suppressed.
  • These Chamber or resonator chamber is different from the adjoining one Section of the transfer body by a Jump in cross section.
  • a first chamber and / or a second chamber may be provided, wherein the Oscillating body separates the two chambers from each other and accordingly at the exit of the first chamber and at the entrance the second chamber is arranged.
  • the transmission body in the area of one chamber and / or in the area of the other Chamber having an adjustable portion, wherein by adjusting the section the volume of the one Chamber and / or the volume of the other chamber variable is.
  • This volume adjustment for example, during installation the transducer according to the invention in the form of a one-time adjustment. It is the same possible, with the help of a corresponding actuator, the volume adjustment the respective chamber depending on predetermined parameters, e.g. Load and / or speed of one Internal combustion engine, during operation of the sound source automatically or perform manually, eliminating that from the transducer transmissible frequency spectrum can be varied.
  • FIG. 1 includes an internal combustion engine 1 of an otherwise not shown Vehicle, in particular a passenger car, a Fresh air line 2, which housed in an engine block 27 Cylinders 3 of the internal combustion engine 1 feeds fresh air.
  • a Fresh air line 2 In the fresh air line 2 is usually a Air filter 4 is arranged, which contains a filter body 5, in the interior of the air filter 4 a clean side 6 of a Raw side 7 separates.
  • An air distributor 8 distributes the supplied Fresh air in front of the engine block 27 to the individual Cylinder 3.
  • an exhaust pipe. 9 connected, which produced in the cylinders 3 Exhaust gases from the internal combustion engine 1 dissipates.
  • the exhaust pipe 9 after the engine block 27 an exhaust manifold 10, which merges the exhaust gases of the cylinder 3.
  • a catalyst 11 is arranged be.
  • the exhaust pipe 9 not shown other components, e.g. an exhaust gas turbocharger and a silencer included.
  • the internal combustion engine forms 1 a sound source, in particular airborne sound generated.
  • airborne sound are under the present Invention understood pressure pulsations, resulting in a gaseous fluid, e.g. Air or exhaust, spread.
  • an inventive device Sound transducer 12 a transmission body 13. With the help of Sound transducer 12 can now on the internal combustion engine 1 airborne sound decoupled, modulated and in or to a Target area are radiated.
  • a destination space can For example, an engine compartment 14 and / or by a End wall 15 from the engine compartment 14 separate interior 16 of the Be a vehicle.
  • Fig. 1 for decoupling the airborne sound of Internal combustion engine 1, an input 17 of the transmission body 13 at a suitable location with the internal combustion engine. 1 be communicatively connected.
  • Fig. 1 are exemplified several different connection points shown, the distinguishable by the letters a to g are. Accordingly, it is possible in particular, the Sound transducer 12 to the fresh air line 2 or to the exhaust pipe 9 connect. Appropriately, the connection is made each relatively close to the engine to damping effects, for example to avoid the catalyst 11 or the filter element 5.
  • the transfer body has 13 an output 18, the modulated airborne sound to the interior 16 radiates out.
  • the output 18 is here as Schallabichtertrichter designed to a purposeful To improve sound radiation.
  • the output 18 can - as shown - in front of the end wall 15, ie within the engine compartment 14 may be arranged. Likewise it is possible the exit 18 directly on the end wall 15 or in the end wall 15th to install.
  • the transfer body 13 also penetrate the end wall 15, so that the output 18th already in the target area, that is arranged in the interior 16.
  • a vibrating body 19 is formed relatively stiff or rigid.
  • the vibrating body 19 consists of the vibrating body 19 to a corresponding stiff or rigid material.
  • the vibrating body 19 by constructive measures have the desired stiffness or strength.
  • the vibrating body 19 is formed as a circular disk.
  • the vibrating body 19 by means of a holder 20 vibrationally supported on the transfer body 13.
  • the holder 20 is designed so that they for the oscillating body 19 translational, bidirectional Vibrational movements enabled by a double arrow indicated direction of vibration 21 parallel to a indicated by an arrow sound propagation direction 22 of the incoming sound and parallel to one, also indicated by an arrow sound propagation direction 23 of the outgoing sound passes.
  • a conventional flexurally soft membrane when swinging accordingly buckles its excitation
  • the vibration behavior takes place in accordance with the invention swinging suspended bending stiff Vibrating body 19 according to another principle.
  • the Oscillator 19 bulges or bends when swinging substantially not, but moves completely accordingly the oscillation frequency parallel to the initial position, what through the oscillatory mount 20 is made possible.
  • the holder 20 is here as a bellows 24 or as a corrugated pipe 25 trained. While a corrugated tube 25 in the rule Made of metal, the bellows is made of rubber or out Made of plastic. The waves or folds of the bellows 24 and the corrugated pipe 25 cause the bellows 24 or the corrugated tube 25 behaves like a spring. Of the Bellows 24 and the corrugated tube 25 is on the one hand, e.g. above a ring 26, attached to the transfer body 13 and carries on the other hand, the vibrating body 19th
  • the holder 20 of the oscillating body 19 in or on the transfer body 13 against spring force in parallel arranged adjustable to the vibration direction 21.
  • the adjustability as well as the spring force arise during training the holder 20 as a corrugated pipe 25 and bellows 24 by itself.
  • the transmission body 13 is sealed gas-tight, so that in particular no clean air or exhaust gas can escape through the outlet 18.
  • a communicating connection between output 18 and input 17 would destroy, for example, the pressure conditions desired in the fresh air line 2 or in the exhaust line 9.
  • the sealing of the transmission body 13 is carried out so that the oscillating body 19 on the one hand, the output side gas pressure p 0 and on the other hand, the input side gas pressure p 1 according to FIG. 2 or p 3 according to FIG. While the output-side pressure p 0 generally corresponds to the atmospheric ambient pressure and accordingly is essentially contant, the input-side pressure p 1 or p 2 depends on the respective operating state of the internal combustion engine 1.
  • FIGS. 2 and 3 two different pressure situations are shown in FIGS. 2 and 3, wherein the inlet-side gas pressure p 1 shown in FIG. 2 is greater than the gas pressure p 2 shown in FIG. 2, with different axial lengths of the bellows 24 and of the corrugated tube 25 goes along.
  • the holder 20 Due to the adjustability of the holder 20 according to the invention can this adapt to the prevailing pressure conditions, so that the bellows 24 and the corrugated tube 25 at Condition according to FIG. 2 expands in the direction of vibration 21 and compressed in the pressure situation in Fig. 3.
  • the Design of the holder 20 takes place so that through the different length the vibration behavior of the vibrating body 19 is not or only slightly affected. This has the consequence that the vibration excitation of the vibrating body 19 by the application of decoupled airborne sound essentially independent of the vibrating body 19 applied pressure differences is.
  • the of the oscillating body 19 generated vibration amplitudes are therefore substantially regardless of the system pressures. This is achieved for example, by a linear or quasi-linear spring constant in the bellows 24 and in the corrugated pipe 25th
  • the vibrating body 19 made of a heat-resistant material, e.g. from sheet metal, and is the metal corrugated pipe 25, for example soldered.
  • the ring 26 and the associated, to the entrance 17 leading portion of the transfer body 13 is then expediently also made of metal.
  • the portion of the transmission body containing the output 18 13 be made of plastic, since this Section not directly exposed to the hot exhaust gases is.
  • FIGS. 2 and 3 has the transfer body 13 between input 17 and outlet 18 a first chamber 28 and a second chamber 29.
  • the first chamber 28 is via a first line section 30 connected to the input 17, wherein in one Transition from this first line section 30 to the first Chamber 28 formed a jump-like cross-sectional widening 31 is.
  • the second chamber 29 via a second line section 32 of the transmission body 13 connected to the output 18, wherein the second chamber 29 via a sudden cross-section decrease 33 in the second line section 32 passes.
  • first pipe section 30 form as ⁇ / 2 resonator, where ⁇ is the wavelength of a preferred frequency is.
  • the bellows 24 and the corrugated tube 25 is cylindrical and coaxially aligned with the respective chamber 28,29.
  • the two Line sections 30 and 32 are coaxial and aligned with the Bellows 24 and aligned to the corrugated pipe 25.
  • the vibrating body 19 is on the one hand am Exit the first chamber 28 and on the other hand at the entrance the second chamber 29 is arranged.
  • the first chamber 28 can together with the integrated vibrating body 19 an assembly form in their interior with hot gases, e.g. with combustion exhaust gases can be acted upon.
  • the bellows 24 and the vibrating body 19 formed as a one-piece or one-piece integral component 34 be, for example, by a blow molding process can be produced.
  • a corresponding adapted Shape of the bellows 24 may be the integral component 34 can also be realized as a cast component.
  • the spring elasticity the bellows 24 and the rigidity of the vibrating body 19 can be achieved by the selected material thicknesses and / or by the geometric shape of the respective Reach section in the integral component 24.
  • the integral body 34 is at the free end of its bellows 24 at 37 connected to the ring 26, e.g. through a bond.
  • the desired suspension properties or rigidities also determined by the material selection be, for example, by the vibrating body 19 a relatively rigid plastic is used during the Bellows 24 made of a relatively flexible plastic or made of rubber.
  • bellows 24 and vibrating body 19 can again be formed as a one-piece integral component 34, wherein the shape here is such that the integral component 34 is produced as an injection molded component.
  • the stiffness of the Oscillating body 19 can also be increased as shown in FIG. 6, that the vibrating body 19 by a suitable shaping, e.g. by a circumferential annular collar 35 and by Webs 36, stiffened.
  • Fig. 7 is such a stiffener of the vibrating body 19 shown by way of example.
  • at Fig. 6 is the free end of the bellows 24 at 38 directly connected to the transfer body 13, for example through a bond.
  • the Bellows 24 is substantially conically shaped.
  • the transfer body has 13 in the region of the second chamber 29 a adjustable section 39, which corresponds to a double arrow 40 relative to the other areas of the transmission body 13 positionable in the sound propagation direction 22,23 is.
  • a adjustable section 39 For example, the volume of the second chamber 29 can be varied. On This way, the resonance behavior of the second chamber 29 to a specific target frequency or a specific target frequency band be matched.
  • This voting process can for example, during assembly of the transducer 12 am Vehicle done. Section 39 will be after the vote fixes and retains the once found setting. at the particular embodiments shown in FIGS.
  • a controller can Actuator 41 as a function of the speed and / or the load of the internal combustion engine 1 actuate.
  • section 39 also has the output 18 of the transmission body 13, so that this in the adjustment of section 39 also is moved relative to the bulkhead 15, is the section 39 in the embodiment of FIG. 9 between arranged two stationary sections of the transfer body 13, so that in particular the position of the output 18 is also invariant with an adjustment of the section 39.
  • FIGS. 10 and 11 therefore differentiate Embodiments of this holder 20 shown.
  • the holder 20 may be e.g. through a hollow cylinder 42 may be formed at the at one axial end of the Vibrating body 19 is attached.
  • the hollow cylinder 42 is by means of a suspension 43 connected to the transfer body 13.
  • the hollow cylinder 42 is also outside on a cylindrical Section 44 of the transmission body 13 attached, the dimensions are coordinated with each other are that the hollow cylinder 20 is substantially gas-tight and low-friction telescopic in the direction of vibration 21 is mounted on section 44.
  • the suspension 43 allows on the one hand the required pressure compensation and on the other hand, the translatory oscillatory motion of Vibrating body 19.
  • the hollow cylinder 42 formed as Holder 20 also in a cylindrical portion 45th the transfer body 13 inserted and adjustable in stroke be stored, and here too the dimensions are coordinated so that the hollow cylinder 42nd essentially frictionless and gas-tight in the cylinder section 45 is stored.
  • this suspension for example, by a coil spring may be formed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Exhaust Silencers (AREA)

Description

Die vorliegende Erfindung betrifft einen Schallwandler für ein Kraftfahrzeug mit den Merkmalen des Oberbegriffs des Anspruchs 1.The present invention relates to a sound transducer for a motor vehicle having the features of the preamble of the claim 1.

Ein derartiger Schallwandler ist beispielsweise aus der DE 199 22 216 A1 bekannt und besitzt einen hohlen Übertragskörper, der an seinem Eingang zur Auskopplung von Luftschall mit einer Frischluftleitung verbunden ist, die Frischluft zu einer Brennkraftmaschine des Fahrzeugs führt. Mit diesem Übertragungskörper ist ein modulierter Luftschall an einem Ausgang des Übertragungskörpers zu einem Innenraum des Fahrzeugs abstrahlbar. Zur gezielten Beeinflussung oder Modulation des ausgekoppelten Luftschalls weist der Übertragungskörper eine als Schwingkörper dienende Membran aus Kunststoff oder Gummi auf, die durch den ausgekoppelten Luftschall zu Schwingungen anregbar ist. Dabei erzeugt die schwingende Membran den modulierten Luftschall und strahlt diesen zum Ausgang des Übertragungskörpers ab. Durch die Größe, Beschaffenheit, Masse und Beschaffenheit der Membran kann die Modulation des ausgekoppelten Luftschalls beeinflußt werden, um so einen gewünschten modulierten Luftschall abstrahlen zu können.Such a transducer is for example from the DE 199 22 216 A1 and has a hollow transfer body, the at his entrance to the extraction of airborne sound connected to a fresh air line, the fresh air too an internal combustion engine of the vehicle leads. With this Transmission body is a modulated airborne sound at one Output of the transmission body to an interior of the vehicle radiated. For targeted influencing or modulation the decoupled airborne sound has the transfer body a serving as a vibrating body membrane made of plastic or rubber, due to the decoupled airborne sound is excitable to vibrations. The generated vibrating diaphragm the modulated airborne sound and radiates this to the output of the transmission body. By the Size, texture, mass and texture of the membrane can affect the modulation of the decoupled airborne sound so as to have a desired modulated airborne sound to be able to radiate.

Für den Fall, daß der Übertragungskörper an die Reinseite der Frischluftleitung angeschlossen ist, erfolgt über die Membran gleichzeitig ein gasdichter Verschluß des Übertragungskörpers, derart, daß an der Membran einerseits der eingangsseitige Gasdruck anliegt und andererseits der ausgangsseitige Gasdruck anliegt. Während der ausgangsseitige Gasdruck in der Regel dem Umgebungsdruck des Fahrzeugs entspricht und somit im wesentlichen konstant ist, kann der eingangsseitige Druck in der Luftansaugleitung einerseits großen Schwankungen unterworfen sein und andererseits beträchlich vom Umgebungsdruck abweichen, insbesondere bei aufgeladenen Motoren. Eine starke Druckdifferenz an der Membran hat jedoch zur Folge, daß sich diese relativ stark durchbiegt. Durch diese Wölbung verändert sich die Schwingungscharakteristik der Membran sehr stark, was zu einer Beeinträchtigung der Funktion des Schallwandlers führt. Des weiteren kann im eingangsseitigen Abschnitt des kommunizierenden Systems gegenüber dem Umgebungsdruck eine Druckänderung von Unterdruck zu Überdruck oder umgekehrt erfolgen, wodurch sich die Wölbung der Membran sprungartig umkehrt, was mit einer unerwünschten Geräuschentwicklung verbunden sein kann.In the event that the transfer body to the clean side the fresh air line is connected via the Membrane at the same time a gas-tight closure of the transmission body, such that on the one hand the input side of the membrane Gas pressure applied and on the other hand, the output side Gas pressure is applied. While the output side gas pressure usually corresponds to the ambient pressure of the vehicle and thus is substantially constant, the Input-side pressure in the air intake line on the one hand be subject to large fluctuations and on the other hand substantial deviate from the ambient pressure, especially at charged engines. A strong pressure difference at the membrane However, this has the consequence that this relatively strong sags. This curvature changes the vibration characteristics the membrane very strong, resulting in impairment the function of the transducer leads. Of another can be in the input-side section of the communicating Systems compared to the ambient pressure a pressure change from negative to positive or vice versa, whereby the curvature of the membrane reverses abruptly, which is associated with unwanted noise can be.

Aus der EP 1 138 887 A2 ist ein weiterer Schallwandler der eingangs genannten Art bekannt, bei dem der Übertragungskörper zur Auskopplung von Luftschall mit seinem Eingang an eine Abgasleitung der Brennkraftmaschine angeschlossen ist. Die Modulation des ausgekoppelten Luftschalls erfolgt auch hier mit Hilfe einer Membran, die zu Schwingungen angeregt wird und am Ausgang des Übertragungskörpers den modulierten Luftschall z.B. in einen Motorraum abstrahlt. Bei dieser Ausführungsform muß der Übertragungskörper gasdicht verschlossen sein, um einen Abgasaustritt in den Motorraum zu verhindern. Der gasdichte Verschluß des Übertragungskörpers erfolgt hierbei wieder durch die Membran, so daß an der Membran einerseits der Abgasdruck herrscht, während andererseits im wesentlichen der Umgebungsdruck anliegt. Da der Abgasdruck im Betrieb der Brennkraftmaschine relativ starken Schwankungen unterworfen ist und regelmäßig deutlich über dem Umgebungsdruck liegt, können die vorstehend geschilderten Probleme auch hier auftreten, da sich die Membran aufgrund der Druckdifferenz wölbt und verspannt. Die damit einhergehende Veränderung der Abstrahlungscharakteristik ist unerwünscht.From EP 1 138 887 A2 a further sound transducer is the initially known type, wherein the transmission body for the extraction of airborne sound with its input to a Exhaust pipe of the internal combustion engine is connected. The modulation of the decoupled airborne sound also occurs here with the help of a membrane that stimulates to vibrate is and at the output of the transmission body modulated Airborne sound, e.g. radiates into an engine compartment. At this Embodiment of the transfer body must be sealed gas-tight be to exhaust passage in the engine compartment too prevent. The gas-tight closure of the transmission body takes place here again through the membrane, so that on the membrane on the one hand the exhaust pressure prevails, while on the other hand essentially the ambient pressure is applied. Because the exhaust pressure during operation of the internal combustion engine relatively strong Is subject to fluctuations and regularly significantly above the ambient pressure, the above-described Problems also occur here because the membrane due the pressure difference bulges and tense. The accompanying Change in the radiation characteristic is undesirable.

Die vorliegende Erfindung beschäftigt sich mit dem Problem, für einen Schallwandler der eingangs genannten Art eine verbesserte Ausführungsform anzugeben, bei der insbesondere die Abhängigkeit von Druckänderungen am Eingang des Übertragungskörpers reduziert ist.The present invention deals with the problem for an acoustic transducer of the type mentioned an improved Specify embodiment, in particular the Dependence of pressure changes at the entrance of the transfer body is reduced.

Dieses Problem wird erfindungsgemäß mit dem Gegenstand des unabhängigen Anspruchs gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche. This problem is inventively with the subject matter of independent claim solved. Advantageous embodiments are the subject of the dependent claims.

Die vorliegende Erfindung beruht auf dem allgemeinen Gedanken, anstelle einer biegeweichen Membran einen starren oder steifen Schwingkörper zu verwenden, der mit Hilfe einer Halterung schwingungsfähig gehaltert ist, wobei diese Halterung gegen Federkraft in der Schwingungsrichtung des Schwingkörpers verstellbar ist. Durch diese Bauweise wird erreicht, daß niederfrequente Druckschwankungen im Eingangsbereich des Übertragungskörpers durch entsprechende Relativverstellungen der Halterung zusammen mit dem daran gehalterten Schwingkörper kompensiert werden können, indem sich die Halterung soweit verstellt, bis die Federkraft ein Gleichgewicht herstellt. Die niederfrequenten Druckschwankungen in der jeweiligen Schallquelle bewegen sich in der Regel in einem nicht hörbaren Frequenzspektrum. Dementsprechend können sie lediglich eine Verstellung der Relativposition des Schwingkörpers erreichen, ohne diesen zur Abgabe einer hörbaren Schallabstrahlung anzuregen. Im Unterschied dazu kann der ausgekoppelte höherfrequente Luftschall den Schwingkörper nach wie vor zu Schwingungen anregen, die eine Abstrahlung von hörbarem, moduliertem Luftschall verursacht. Die vom ausgekoppelten Luftschall am Schwingkörper anregbaren Amplituden sind dabei im wesentlichen unabhängig von der Auslenkung der Halterung, so daß die Schwingungscharakteristik des Schwingkörpers für den hörbaren Frequenzbereich im wesentlichen unabhängig von dem an der Eingangsseite des Übertragungskörpers herrschenden Druck ist.The present invention is based on the general idea Instead of a flexible membrane a rigid or To use stiff vibrating body, with the help of a bracket is held vibratory, this holder against spring force in the vibration direction of the vibrating body is adjustable. By this construction is achieved that low - frequency pressure fluctuations in the input area of Transmission body by appropriate relative adjustments the holder together with the vibrating body held by it can be compensated by the holder so far adjusted until the spring force establishes a balance. The low-frequency pressure fluctuations in the respective Sound source usually does not move in one audible frequency spectrum. Accordingly, they can only an adjustment of the relative position of the vibrating body reach, without this for the delivery of an audible sound radiation to stimulate. In contrast, the decoupled higher-frequency airborne sound the vibrating body after to excite vibrations that cause a radiation of audible, caused modulated airborne sound. The decoupled from Airborne noise at the vibrating body are excitable amplitudes essentially independent of the deflection of the holder, so that the vibration characteristic of the vibrating body essentially independent of the audible frequency range from that at the input side of the transmission body is prevailing pressure.

Mit Hilfe des erfindungsgemäßen Schallwandlers kann somit aus einer Frischluftleitung oder aus einer Abgasleitung einer Brennkraftmaschine unabhängig von Druckschwankungen, die während des Betriebs der Brennkraftmaschine in der Frischluftleitung oder in der Abgasleitung auftreten, Luftschall ausgekoppelt und mit einem im wesentlichen konstant bleibenden Modulationsverhalten vom Schwingkörper in modulierten Luftschall umgewandelt werden.With the help of the transducer according to the invention can thus from a fresh air line or from an exhaust pipe one Internal combustion engine independent of pressure fluctuations, the during operation of the internal combustion engine in the fresh air line or occur in the exhaust pipe, airborne sound decoupled and with a substantially constant remaining Modulation behavior of the oscillating body in modulated Airborne sound to be converted.

Bei einer bevorzugten Ausführungsform kann die Halterung als Wellrohr aus Metall oder als Faltenbalg aus Kunststoff oder Gummi ausgebildet sein, wobei dieses Wellrohr bzw. der Faltenbalg einenends den Schwingkörper aufweist und anderenends am Übertragungskörper befestigt ist. Ein Wellrohr und ein Faltenbalg können relativ preiswert hergestellt und außerdem so ausgebildet werden, daß sie gleichzeitig als Feder wirken und aufgrund der inneren Elastizität stets eine definierte Ausgangslage einzunehmen suchen. Durch die am Schwingkörper herrschende Druckdifferenz ergibt sich eine am Wellrohr bzw. am Faltenbalg wirkende resultierende Kraft, die das Wellrohr bzw. den Faltenbalg bezüglich seiner Längsrichtung auseinanderzieht oder zusammendrückt. Innerhalb eines zulässigen Verstellbereichs, der auf die zu erwartenden Druckdifferenzen abgestimmt ist, ermöglicht das Wellrohr bzw. der Faltenbalg translatorische Schwingungsbewegungen durch Luftschallanregung. Die Charakteristik des vom Schwingkörper abgestrahlten modulierten Luftschalls ist durch die Beweglichkeit des Wellrohrs bzw. Faltenbalgs nicht oder nur geringfügig von der momentanten Dehnung oder Kompression des Wellrohrs bzw. Faltenbalgs abhängig. Bei einer entsprechenden Auslegung kann somit über den gesamten Betriebsbereich der jeweiligen Schallwelle, z.B. Brennkraftmaschine, ein gewünschter Sound generiert werden.In a preferred embodiment, the holder as Corrugated pipe made of metal or as a bellows made of plastic or Be formed rubber, said corrugated pipe or the bellows at one end has the oscillating body and at the other end attached to the transfer body. A corrugated pipe and a Bellows can be made relatively inexpensive and as well be formed so that they act simultaneously as a spring and due to the internal elasticity always a defined Seek to take starting position. By the on the oscillating body prevailing pressure difference results at the corrugated tube or resulting force acting on the bellows, the corrugated pipe or pulls the bellows with respect to its longitudinal direction or squeezing. Within a permissible Adjustment range, based on the expected pressure differences is matched, allows the corrugated pipe or the bellows translatory oscillatory movements due to airborne sound excitation. The characteristic of the radiated from the vibrating body Modulated airborne sound is due to the mobility of the corrugated pipe or bellows not or only slightly from the momentary expansion or compression of the corrugated tube or bellows dependent. At a corresponding Interpretation can thus over the entire operating range of the respective sound wave, e.g. Internal combustion engine, a desired one Sound to be generated.

Die als Kunststoff- oder Gummi-Faltenbalg ausgebildete Halterung kommt vorwiegend dann zum Einsatz, wenn der Übertragungskörper in einem Bereich relativ niedriger Temperaturen an die Schallwelle angeschlossen ist. Beispielsweise ist der Übertragungskörper an eine Ansaugleitung einer Brennkraftmaschine angeschlossen. Wenn der Übertragungskörper an einen relativ heißen Bereich der Schallwelle, z.B. an eine Abgasleitung einer Brennkraftmaschine, angeschlossen werden soll, wird die als Metall-Wellrohr ausgebildete Halterung bevorzugt. In entsprechender Weise ist dann auch der jeweilige, mit der Schallquelle verbundene Abschnitt des Übertragungskörpers aus Metall (heißer Bereich) bzw. aus Kunststoff (kalter Bereich) hergestellt.Designed as a plastic or rubber bellows bracket is mainly used when the transmission body in a range of relatively low temperatures is connected to the sound wave. For example, the Transfer body to an intake manifold of an internal combustion engine connected. When the transfer body to a relatively hot region of the sound wave, e.g. to an exhaust pipe an internal combustion engine, to be connected, the metal-corrugated tube holder is preferred. Correspondingly, the respective, portion of the transmission body connected to the sound source made of metal (hot area) or plastic (cold area) made.

Sofern der Übertragungskörper den Luftschall an einem relativ heißen Abschnitt der Schallquelle, z.B. an einem Abgaskrümmer oder an einem Abgassammelrohr einer Brennkraftmaschine, abzweigen soll, ist der Schwingkörper aus einem hitzebeständigen Material, z.B. aus Metall, Glas oder Keramik, hergestellt und am Metall-Wellrohr befestigt.If the transmission body the airborne sound at a relative hot section of the sound source, e.g. on an exhaust manifold or at an exhaust manifold of an internal combustion engine, branch off, the vibrating body is made of a heat-resistant Material, e.g. made of metal, glass or ceramic, made and attached to the metal corrugated pipe.

Gemäß einer Weiterbildung kann der Übertragungskörper eine Kammer aufweisen, wobei der Schwingkörper am Eintritt oder am Austritt dieser Kammer oder zwischen Eintritt und Austritt angeordnet ist. Zweckmäßig wird diese Kammer als Resonatorkammer ausgebildet, um dadurch gezielt den ausgekoppelten Luftschall zur Anregung des Schwingkörpers und/oder den vom Schwingkörper abgestrahlten Luftschall zu modulieren. Beispielsweise sollen bestimmte Frequenzen bzw. Frequenzbänder verstärkt werden, während andere Frequenzen oder Frequenzbänder gedämpft oder unterdrückt werden sollen. Diese Kammer oder Resonatorkammer unterscheidet sich vom daran anschließenden Abschnitt des Übertragungskörpers durch einen Querschnittssprung.According to a development of the transmission body can a Have chamber, wherein the vibrating body at the entrance or at the exit of this chamber or between entry and exit is arranged. Appropriately, this chamber is called Resonatorkammer trained to thereby specifically decoupled Airborne sound to excite the oscillating body and / or the to modulate airborne sound emitted by the oscillating body. For example, certain frequencies or frequency bands be amplified while other frequencies or frequency bands to be dampened or suppressed. These Chamber or resonator chamber is different from the adjoining one Section of the transfer body by a Jump in cross section.

Bei einer besonderen Ausführungsform können eine erste Kammer und/oder eine zweite Kammer vorgesehen sein, wobei der Schwingkörper die beiden Kammern voneinander trennt und dementsprechend am Austritt der ersten Kammer sowie am Eintritt der zweiten Kammer angeordnet ist.In a particular embodiment, a first chamber and / or a second chamber may be provided, wherein the Oscillating body separates the two chambers from each other and accordingly at the exit of the first chamber and at the entrance the second chamber is arranged.

Bei einer besonderen Weiterbildung kann der Übertragungskörper im Bereich der einen Kammer und/oder im Bereich der anderen Kammer einen verstellbaren Abschnitt aufweisen, wobei durch eine Verstellung des Abschnitts das Volumen der einen Kammer und/oder das Volumen der anderen Kammer variierbar ist. Mit Hilfe dieser Maßnahme kann somit das Resonanzverhalten der jeweiligen Kammer eingestellt und beispielsweise an das Frequenzspektrum der Schallquelle angepaßt werden. Diese Volumen-Verstellung kann beispielsweise bei der Installation des erfindungsgemäßen Schallwandlers in Form einer einmaligen Justage durchgeführt werden. Ebenso ist es möglich, mit Hilfe eines entsprechenden Aktuators die Volumen-Verstellung der jeweiligen Kammer in Abhängigkeit von vorbestimmten Parametern, z.B. Last und/oder Drehzahl einer Brennkraftmaschine, im Betrieb der Schallquelle automatisch oder manuell durchzuführen, wodurch das vom Schallwandler übertragbare Frequenzspektrum variiert werden kann.In a particular embodiment, the transmission body in the area of one chamber and / or in the area of the other Chamber having an adjustable portion, wherein by adjusting the section the volume of the one Chamber and / or the volume of the other chamber variable is. With the help of this measure can thus the resonance behavior set the respective chamber and, for example be adapted to the frequency spectrum of the sound source. This volume adjustment, for example, during installation the transducer according to the invention in the form of a one-time adjustment. It is the same possible, with the help of a corresponding actuator, the volume adjustment the respective chamber depending on predetermined parameters, e.g. Load and / or speed of one Internal combustion engine, during operation of the sound source automatically or perform manually, eliminating that from the transducer transmissible frequency spectrum can be varied.

Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Further important features and advantages of the invention result from the subclaims, from the drawings and from the associated figure description with reference to the drawings.

Es versteht sich, daß die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the above and the following yet to be explained features not only in each case specified combination, but also in other combinations or be used alone, without the To leave the scope of the present invention.

Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder funktional gleiche oder ähnliche Bauteile beziehen.Preferred embodiments of the invention are in the Drawings are shown in the description below explained in more detail, wherein the same reference numerals to identical or functionally identical or similar components Respectively.

Es zeigen, jeweils schematisch,

Fig. 1
eine stark vereinfachte Darstellung einer Brennkraftmaschine, die mit einem Schallwandler nach der Erfindung ausgestattet ist,
Fig. 2 und 3
vereinfachte Darstellungen des Schallwandlers bei unterschiedlichen Druckverhältnissen,
Fig. 4 bis 6
Schnittansichten durch verschiedene Ausführungsformen eines Schwingkörpers mit Halterung,
Fig. 7
eine Draufsicht auf den Schwingkörper der Fig. 6,
Fig. 8 und 9
vereinfachte Ansichten auf den Schallwandler bei verschiedenen Ausführungsformen mit variablem Kammervolumen,
Fig. 10 und 11
vereinfachte Ansichten auf weitere Ausführungsformen des Schallwandlers.
Show, in each case schematically,
Fig. 1
a highly simplified representation of an internal combustion engine, which is equipped with a sound transducer according to the invention,
FIGS. 2 and 3
simplified representations of the transducer at different pressure ratios,
4 to 6
Sectional views through various embodiments of a vibrating body with holder,
Fig. 7
a top view of the oscillating body of Fig. 6,
8 and 9
simplified views of the transducer in various embodiments with variable chamber volume,
10 and 11
simplified views of other embodiments of the transducer.

Entsprechend der vereinfachten Darstellung der Fig. 1 umfaßt eine Brennkraftmaschine 1 eines im übrigen nicht dargestellten Fahrzeugs, insbesondere eines Personenkraftwagens, eine Frischluftleitung 2, die in einem Motorblock 27 untergebrachten Zylindern 3 der Brennkraftmaschine 1 Frischluft zuführt. In der Frischluftleitung 2 ist üblicherweise ein Luftfilter 4 angeordnet, das einen Filterkörper 5 enthält, der im Inneren des Luftfilters 4 eine Reinseite 6 von einer Rohseite 7 trennt. Ein Luftverteiler 8 verteilt die zugeführte Frischluft vor dem Motorblock 27 auf die einzelnen Zylinder 3.According to the simplified representation of FIG. 1 includes an internal combustion engine 1 of an otherwise not shown Vehicle, in particular a passenger car, a Fresh air line 2, which housed in an engine block 27 Cylinders 3 of the internal combustion engine 1 feeds fresh air. In the fresh air line 2 is usually a Air filter 4 is arranged, which contains a filter body 5, in the interior of the air filter 4 a clean side 6 of a Raw side 7 separates. An air distributor 8 distributes the supplied Fresh air in front of the engine block 27 to the individual Cylinder 3.

An die Brennkraftmaschine 1 ist außerdem eine Abgasleitung 9 angeschlossen, welche die in den Zylindern 3 produzierten Abgase von der Brennkraftmaschine 1 abführt. Hierzu weist die Abgasleitung 9 nach dem Motorblock 27 einen Abgassammler 10 auf, der die Abgase der Zylinder 3 zusammenführt. In der Abgasleitung 9 kann beispielsweise ein Katalysator 11 angeordnet sein. Des weiteren kann die Abgasleitung 9 nicht gezeigte weitere Komponenten, wie z.B. einen Abgasturbolader und einen Schalldämpfer enthalten.To the internal combustion engine 1 also has an exhaust pipe. 9 connected, which produced in the cylinders 3 Exhaust gases from the internal combustion engine 1 dissipates. For this purpose points the exhaust pipe 9 after the engine block 27 an exhaust manifold 10, which merges the exhaust gases of the cylinder 3. In the Exhaust pipe 9, for example, a catalyst 11 is arranged be. Furthermore, the exhaust pipe 9 not shown other components, e.g. an exhaust gas turbocharger and a silencer included.

Im Rahmen der vorliegenden Erfindung bildet die Brennkraftmaschine 1 eine Schallquelle, die insbesondere Luftschall erzeugt. Unter "Luftschall" werden im Rahmen der vorliegenden Erfindung Druckpulsationen verstanden, die sich in einem gasförmigen Fluid, z.B. Luft oder Abgas, ausbreiten.In the context of the present invention, the internal combustion engine forms 1 a sound source, in particular airborne sound generated. Under "airborne sound" are under the present Invention understood pressure pulsations, resulting in a gaseous fluid, e.g. Air or exhaust, spread.

Gemäß den Fig. 2,3 und 8 bis 11 umfaßt ein erfindungsgemäßer Schallwandler 12 einen Übertragungskörper 13. Mit Hilfe des Schallwandlers 12 kann nun an der Brennkraftmaschine 1 Luftschall ausgekoppelt, moduliert und in einen oder zu einem Zielraum abgestrahlt werden. Ein derartiger Zielraum kann beispielsweise ein Motorraum 14 und/oder ein durch eine Stirnwand 15 vom Motorraum 14 getrennter Innenraum 16 des Fahrzeugs sein.Referring to Figs. 2, 3 and 8 to 11, an inventive device Sound transducer 12 a transmission body 13. With the help of Sound transducer 12 can now on the internal combustion engine 1 airborne sound decoupled, modulated and in or to a Target area are radiated. Such a destination space can For example, an engine compartment 14 and / or by a End wall 15 from the engine compartment 14 separate interior 16 of the Be a vehicle.

Entsprechend Fig. 1 kann zur Auskopplung des Luftschalls der Brennkraftmaschine 1 ein Eingang 17 des Übertragungskörpers 13 an einer geeigneten Stelle mit der Brennkraftmaschine 1 kommunizierend verbunden sein. In Fig. 1 sind dazu exemplarisch mehrere verschiedene Anschlußstellen dargestellt, die durch die Buchstaben a bis g voneinander unterscheidbar sind. Dementsprechend ist es insbesondere möglich, den Schallwandler 12 an die Frischluftleitung 2 oder an die Abgasleitung 9 anzuschließen. Zweckmäßig erfolgt der Anschluß jeweils relativ motornah, um Dämpfungseffekte, beispielsweise des Katalysators 11 oder des Filterelements 5 zu vermeiden.According to Fig. 1, for decoupling the airborne sound of Internal combustion engine 1, an input 17 of the transmission body 13 at a suitable location with the internal combustion engine. 1 be communicatively connected. In Fig. 1 are exemplified several different connection points shown, the distinguishable by the letters a to g are. Accordingly, it is possible in particular, the Sound transducer 12 to the fresh air line 2 or to the exhaust pipe 9 connect. Appropriately, the connection is made each relatively close to the engine to damping effects, for example to avoid the catalyst 11 or the filter element 5.

Entsprechend den Fig. 2 und 3 besitzt der Übertragungskörper 13 einen Ausgang 18, der den modulierten Luftschall zum Innenraum 16 hin abstrahlt. Der Ausgang 18 ist hier als Schallabstrahltrichter ausgestaltet, um eine gezielte Schallabstrahlung zu verbessern. Der Ausgang 18 kann - wie dargestellt - vor der Stirnwand 15, also innerhalb des Motorraums 14 angeordnet sein. Ebenso ist es möglich, den Ausgang 18 direkt an der Stirnwand 15 oder in der Stirnwand 15 anzubringen. Des weiteren kann der Übertragungskörper 13 auch die Stirnwand 15 durchdringen, so daß der Ausgang 18 bereits im Zielraum, also im Innenraum 16 angeordnet ist.According to FIGS. 2 and 3, the transfer body has 13 an output 18, the modulated airborne sound to the interior 16 radiates out. The output 18 is here as Schallabichtertrichter designed to a purposeful To improve sound radiation. The output 18 can - as shown - in front of the end wall 15, ie within the engine compartment 14 may be arranged. Likewise it is possible the exit 18 directly on the end wall 15 or in the end wall 15th to install. Furthermore, the transfer body 13 also penetrate the end wall 15, so that the output 18th already in the target area, that is arranged in the interior 16.

Für die Schallwandlung bzw. Schallmodulation enthält der Übertragungskörper 13 einen Schwingkörper 19, der erfindungsgemäß relativ steif oder starr ausgebildet ist. Beispielsweise besteht der Schwingkörper 19 dazu aus einem entsprechend steifen oder starren Material. Alternativ oder zusätzlich kann der Schwingkörper 19 durch konstruktive Maßnahmen die gewünschte Steifigkeit oder Festigkeit besitzen. Zweckmäßig ist der Schwingkörper 19 als Kreisscheibe ausgebildet. For the sound conversion or sound modulation contains the Transmission body 13 a vibrating body 19, according to the invention is formed relatively stiff or rigid. For example consists of the vibrating body 19 to a corresponding stiff or rigid material. Alternatively or in addition can the vibrating body 19 by constructive measures have the desired stiffness or strength. Suitably, the vibrating body 19 is formed as a circular disk.

Erfindungsgemäß ist der Schwingkörper 19 mittels einer Halterung 20 schwingungsfähig am Übertragungskörper 13 gehaltert. Die Halterung 20 ist dabei so ausgestaltet, daß sie für den Schwingkörper 19 translatorische, bidirektionale Schwingungsbewegungen ermöglicht, deren durch einen Doppelpfeil angedeutete Schwingungsrichtung 21 parallel zu einer durch einen Pfeil dargestellten Schallausbreitungsrichtung 22 des ankommenden Schalls sowie parallel zu einer, ebenfalls durch einen Pfeil dargestellten Schallausbreitungsrichtung 23 des abgehenden Schalls verläuft. Während sich eine herkömmliche biegeweiche Membran beim Schwingen entsprechend ihrer Anregung wölbt, erfolgt das Schwingungsverhalten beim erfindungsgemäß schwingend aufgehängten biegesteifen Schwingkörper 19 nach einem anderen Prinzip. Der Schwingkörper 19 wölbt oder biegt sich beim Schwingen im wesentlichen nicht, sondern bewegt sich komplett entsprechend der Schwingungsfrequenz parallel zur Ausgangslage, was durch die schwingungsfähige Halterung 20 ermöglicht wird.According to the invention the vibrating body 19 by means of a holder 20 vibrationally supported on the transfer body 13. The holder 20 is designed so that they for the oscillating body 19 translational, bidirectional Vibrational movements enabled by a double arrow indicated direction of vibration 21 parallel to a indicated by an arrow sound propagation direction 22 of the incoming sound and parallel to one, also indicated by an arrow sound propagation direction 23 of the outgoing sound passes. While a conventional flexurally soft membrane when swinging accordingly buckles its excitation, the vibration behavior takes place in accordance with the invention swinging suspended bending stiff Vibrating body 19 according to another principle. Of the Oscillator 19 bulges or bends when swinging substantially not, but moves completely accordingly the oscillation frequency parallel to the initial position, what through the oscillatory mount 20 is made possible.

Die Halterung 20 ist hier als Faltenbalg 24 oder als Wellrohr 25 ausgebildet. Während ein Wellrohr 25 in der Regel aus Metall besteht, ist der Faltenbalg aus Gummi oder aus Kunststoff hergestellt. Die Wellen oder Falten des Faltenbalgs 24 bzw. des Wellrohrs 25 bewirken, daß sich der Faltenbalg 24 bzw. das Wellrohr 25 wie eine Feder verhält. Der Faltenbalg 24 bzw. das Wellrohr 25 ist einerseits, z.B. über einen Ring 26, am Übertragungskörper 13 befestigt und trägt andererseits den Schwingkörper 19. The holder 20 is here as a bellows 24 or as a corrugated pipe 25 trained. While a corrugated tube 25 in the rule Made of metal, the bellows is made of rubber or out Made of plastic. The waves or folds of the bellows 24 and the corrugated pipe 25 cause the bellows 24 or the corrugated tube 25 behaves like a spring. Of the Bellows 24 and the corrugated tube 25 is on the one hand, e.g. above a ring 26, attached to the transfer body 13 and carries on the other hand, the vibrating body 19th

Erfindungsgemäß ist die Halterung 20 des Schwingkörpers 19 im bzw. am Übertragungskörper 13 gegen Federkraft parallel zur Schwingungsrichtung 21 verstellbar angeordnet. Die Verstellbarkeit sowie die Federkraft ergeben sich bei der Ausbildung der Halterung 20 als Wellrohr 25 bzw. als Faltenbalg 24 von selbst.According to the invention, the holder 20 of the oscillating body 19 in or on the transfer body 13 against spring force in parallel arranged adjustable to the vibration direction 21. The adjustability as well as the spring force arise during training the holder 20 as a corrugated pipe 25 and bellows 24 by itself.

Im Bereich des Schwingkörpers 19 ist der Übertragungskörper 13 gasdicht verschlossen, so daß insbesondere keine Reinluft oder kein Abgas durch den Ausgang 18 austreten kann. Außerdem würde eine kommunizierende Verbindung zwischen Ausgang 18 und Eingang 17 beispielsweise die in der Frischluftleitung 2 bzw. in der Abgasleitung 9 erwünschten Druckverhältnisse zerstören. Die Abdichtung des Übertragungskörpers 13 erfolgt dabei so, daß am Schwingkörper 19 einerseits der ausgangsseitige Gasdruck p0 und andererseits der eingangsseitige Gasdruck p1 gemäß Fig. 2 bzw. p3 gemäß Fig. 3 anliegt. Während der ausgangsseitige Druck p0 in der Regel dem atmosphärischen Umgebungsdruck entspricht und dementsprechend im wesentlichen kontant ist, hängt der eingangsseitig Druck p1 bzw. p2 vom jeweiligen Betriebszustand der Brennkraftmaschine 1 ab. Exemplarisch sind in den Fig. 2 und 3 zwei unterschiedliche Drucksituationen dargestellt, wobei der in Fig. 2 gezeigte eingangsseitige Gasdruck p1 größer ist als der in Fig. 2 gezeigte Gasdruck p2, was mit unterschiedlichen axialen Längen des Faltenbalgs 24 bzw. des Wellrohrs 25 einhergeht. In the region of the oscillating body 19, the transmission body 13 is sealed gas-tight, so that in particular no clean air or exhaust gas can escape through the outlet 18. In addition, a communicating connection between output 18 and input 17 would destroy, for example, the pressure conditions desired in the fresh air line 2 or in the exhaust line 9. The sealing of the transmission body 13 is carried out so that the oscillating body 19 on the one hand, the output side gas pressure p 0 and on the other hand, the input side gas pressure p 1 according to FIG. 2 or p 3 according to FIG. While the output-side pressure p 0 generally corresponds to the atmospheric ambient pressure and accordingly is essentially contant, the input-side pressure p 1 or p 2 depends on the respective operating state of the internal combustion engine 1. By way of example, two different pressure situations are shown in FIGS. 2 and 3, wherein the inlet-side gas pressure p 1 shown in FIG. 2 is greater than the gas pressure p 2 shown in FIG. 2, with different axial lengths of the bellows 24 and of the corrugated tube 25 goes along.

Durch die erfindungsgemäße Verstellbarkeit der Halterung 20 kann sich diese an die herrschenden Druckverhältnisse anpassen, so daß sich der Faltenbalg 24 bzw. das Wellrohr 25 beim Zustand gemäß Fig. 2 in der Schwingungsrichtung 21 ausdehnt und sich bei der Drucksituation in Fig. 3 komprimiert. Die Auslegung der Halterung 20 erfolgt dabei so, daß durch die unterschiedliche Länge das Schwingungsverhalten des Schwingkörpers 19 nicht oder nur unwesentlich beeinträchtigt wird. Dies hat zur Folge, daß die Schwingungsanregung des Schwingkörpers 19 durch die Beaufschlagung mit ausgekoppeltem Luftschall im wesentlichen unabhängig von den am Schwingkörper 19 anliegenden Druckdifferenzen ist. Die vom Schwingkörper 19 erzeugbaren Schwingungsamplituden sind daher im wesentlichen unabhängig von den Systemdrücken. Erzielt wird dies beispielsweise durch eine lineare oder quasi lineare Federkonstante im Faltenbalg 24 bzw. im Wellrohr 25.Due to the adjustability of the holder 20 according to the invention can this adapt to the prevailing pressure conditions, so that the bellows 24 and the corrugated tube 25 at Condition according to FIG. 2 expands in the direction of vibration 21 and compressed in the pressure situation in Fig. 3. The Design of the holder 20 takes place so that through the different length the vibration behavior of the vibrating body 19 is not or only slightly affected. This has the consequence that the vibration excitation of the vibrating body 19 by the application of decoupled airborne sound essentially independent of the vibrating body 19 applied pressure differences is. The of the oscillating body 19 generated vibration amplitudes are therefore substantially regardless of the system pressures. This is achieved for example, by a linear or quasi-linear spring constant in the bellows 24 and in the corrugated pipe 25th

Wenn der Schallwandler 12 an der Abgasseite der Brennkraftmaschine 1 den Luftschall auskoppeln soll, müssen die zumindest in der Nähe des Motorblocks 27 herrschenden hohen Temperaturen berücksichtigt werden. Beispielsweise besteht dann der Schwingkörper 19 aus einem hitzebeständigen Material, z.B. aus Blech, und ist am Metall-Wellrohr 25 beispielsweise angelötet. Der Ring 26 und der damit verbundene, zum Eingang 17 führende Abschnitt des Übertragungskörpers 13 ist dann zweckmäßig ebenfalls aus Metall hergestellt. Im Unterschied dazu kann der den Ausgang 18 enthaltende Abschnitt des Übertragungskörpers 13 aus Kunststoff hergestellt sein, da dieser Abschnitt den heißen Abgasen nicht direkt ausgesetzt ist.When the sound transducer 12 on the exhaust side of the internal combustion engine 1 is to decouple the airborne sound, at least in the vicinity of the engine block 27 prevailing high temperatures be taken into account. For example, then exists the vibrating body 19 made of a heat-resistant material, e.g. from sheet metal, and is the metal corrugated pipe 25, for example soldered. The ring 26 and the associated, to the entrance 17 leading portion of the transfer body 13 is then expediently also made of metal. In difference For this purpose, the portion of the transmission body containing the output 18 13 be made of plastic, since this Section not directly exposed to the hot exhaust gases is.

Gemäß der in den Fig. 2 und 3 gezeigten besonderen Ausführungsform besitzt der Übertragungskörper 13 zwischen Eingang 17 und Ausgang 18 eine erste Kammer 28 und eine zweite Kammer 29. Die erste Kammer 28 ist über einen ersten Leitungsabschnitt 30 mit dem Eingang 17 verbunden, wobei in einem Übergang von diesem ersten Leitungsabschnitt 30 zur ersten Kammer 28 eine sprungartige Querschnittserweiterung 31 ausgebildet ist. Im Unterschied dazu ist die zweite Kammer 29 über einen zweiten Leitungsabschnitt 32 des Übertragungskörpers 13 mit dem Ausgang 18 verbunden, wobei die zweite Kammer 29 über eine sprungartige Querschnittsabnahme 33 in den zweiten Leitungsabschnitt 32 übergeht. Zweckmäßig sind die beiden Kammern, zumindest jedoch eine davon, als Resonatorkammer ausgebildet; d.h., die jeweilige Kammer 28,29 ist im Hinblick auf bestimmte Frequenzen oder Frequenzbänder ausgelegt, die vom Schallwandler bevorzugt abgestrahlt werden sollen.According to the particular embodiment shown in FIGS. 2 and 3 has the transfer body 13 between input 17 and outlet 18 a first chamber 28 and a second chamber 29. The first chamber 28 is via a first line section 30 connected to the input 17, wherein in one Transition from this first line section 30 to the first Chamber 28 formed a jump-like cross-sectional widening 31 is. In contrast, the second chamber 29 via a second line section 32 of the transmission body 13 connected to the output 18, wherein the second chamber 29 via a sudden cross-section decrease 33 in the second line section 32 passes. Appropriately, the two chambers, but at least one of them, as a resonator chamber educated; that is, the respective chamber 28, 29 is in Designed for specific frequencies or frequency bands, which are preferably emitted by the sound transducer should.

Zusätzlich ist es möglich, den ersten Leitungsabschnitt 30 als λ/2-Resonator auszubilden, wobei λ die Wellenlänge einer bevorzugten Frequenz ist.In addition, it is possible to use the first pipe section 30 form as λ / 2 resonator, where λ is the wavelength of a preferred frequency is.

Bei den Ausführungsformen der Fig. 2 und 3 ist der Faltenbalg 24 bzw. das Wellrohr 25 zylindrisch ausgebildet und koaxial zur jeweiligen Kammer 28,29 ausgerichtet. Die beiden Leitungsabschnitte 30 und 32 sind koaxial und fluchtend zum Faltenbalg 24 bzw. zum Wellrohr 25 ausgerichtet.In the embodiments of Figs. 2 and 3, the bellows 24 and the corrugated tube 25 is cylindrical and coaxially aligned with the respective chamber 28,29. The two Line sections 30 and 32 are coaxial and aligned with the Bellows 24 and aligned to the corrugated pipe 25.

Bei der hier gezeigten bevorzugten Ausführungsform sind die beiden Kammern 28 und 29 durch den Schwingkörper 19 voneinander getrennt, d.h., der Schwingkörper 19 ist einerseits am Austritt der ersten Kammer 28 und andererseits am Eintritt der zweiten Kammer 29 angeordnet. Die erste Kammer 28 kann zusammen mit dem integrierten Schwingkörper 19 eine Baugruppe bilden, die in ihrem Inneren mit Heißgasen, z.B. mit Verbrennungsabgasen beaufschlagbar ist.In the preferred embodiment shown here are the two chambers 28 and 29 through the vibrating body 19 from each other separated, that is, the vibrating body 19 is on the one hand am Exit the first chamber 28 and on the other hand at the entrance the second chamber 29 is arranged. The first chamber 28 can together with the integrated vibrating body 19 an assembly form in their interior with hot gases, e.g. with combustion exhaust gases can be acted upon.

Gemäß Fig. 4 können der Faltenbalg 24 und die Schwingkörper 19 als einteiliges oder einstückiges Integralbauteil 34 ausgebildet sein, das beispielsweise durch ein Blasformverfahren hergestellt werden kann. Bei einer entsprechenden angepaßten Gestalt des Faltenbalgs 24 kann das Integralbauteil 34 auch als Gußbauteil realisiert werden. Die Federelastizität des Faltenbalgs 24 und die Steifigkeit des Schwingkörpers 19 lassen sich dabei durch die gewählten Materialstärken und/oder durch die geometrische Formgebung des jeweiligen Abschnitts im Integralbauteil 24 erreichen. Der Integralkörper 34 ist am freien Ende seines Faltenbalgs 24 bei 37 mit dem Ring 26 verbunden, z.B. durch eine Verklebung.According to Fig. 4, the bellows 24 and the vibrating body 19 formed as a one-piece or one-piece integral component 34 be, for example, by a blow molding process can be produced. With a corresponding adapted Shape of the bellows 24 may be the integral component 34 can also be realized as a cast component. The spring elasticity the bellows 24 and the rigidity of the vibrating body 19 can be achieved by the selected material thicknesses and / or by the geometric shape of the respective Reach section in the integral component 24. The integral body 34 is at the free end of its bellows 24 at 37 connected to the ring 26, e.g. through a bond.

Gemäß Fig. 5 können die gewünschten Federungseigenschaften bzw. Steifigkeiten auch durch die Materialauswahl mitbestimmt werden, indem für den Schwingkörper 19 beispielsweise ein relativ steifer Kunststoff verwendet wird, während der Faltenbalg 24 aus einem relativ flexiblen Kunststoff oder aus Gummi hergestellt ist. Dabei kann der Faltenbalg 24 an den zuvor hergestellten Schwingkörper 19 angeformt, insbesondere angespritzt werden. Ebenso ist es möglich, den Schwingkörper 19 an den zuvor hergestellten Faltenbalg 24 anzuformen, insbesondere anzuspritzen.According to Fig. 5, the desired suspension properties or rigidities also determined by the material selection be, for example, by the vibrating body 19 a relatively rigid plastic is used during the Bellows 24 made of a relatively flexible plastic or made of rubber. In this case, the bellows 24 on formed the previously manufactured vibrating body 19, in particular be sprayed. It is also possible to use the Vibrating body 19 to the bellows 24 previously prepared to mold, in particular to inject.

Gemäß Fig. 6 können Faltenbalg 24 und Schwingkörper 19 wieder als einteiliges Integralbauteil 34 ausgebildet sein, wobei die Formgebung hier so erfolgt, daß das Integralbauteil 34 als Spritzgußbauteil herstellbar ist. Die Steifigkeit des Schwingkörpers 19 kann gemäß Fig. 6 auch dadurch erhöht werden, daß der Schwingkörper 19 durch eine geeignete Formgebung, z.B. durch einen umlaufenden Ringkragen 35 sowie durch Stege 36, versteift ist. In Fig. 7 ist eine derartige Versteifung des Schwingkörpers 19 exemplarisch dargestellt. Bei Fig. 6 ist das freie Ende des Faltenbalgs 24 bei 38 direkt mit dem Übertragungskörper 13 verbunden, beispielsweise durch eine Verklebung. Bei dieser Ausführungsform ist der Faltenbalg 24 im wesentlichen konisch geformt.According to Fig. 6, bellows 24 and vibrating body 19 can again be formed as a one-piece integral component 34, wherein the shape here is such that the integral component 34 is produced as an injection molded component. The stiffness of the Oscillating body 19 can also be increased as shown in FIG. 6, that the vibrating body 19 by a suitable shaping, e.g. by a circumferential annular collar 35 and by Webs 36, stiffened. In Fig. 7 is such a stiffener of the vibrating body 19 shown by way of example. at Fig. 6 is the free end of the bellows 24 at 38 directly connected to the transfer body 13, for example through a bond. In this embodiment, the Bellows 24 is substantially conically shaped.

Bei den Ausführungsformen der Fig. 8 und 9 besitzt der Übertragungskörper 13 im Bereich der zweiten Kammer 29 einen verstellbaren Abschnitt 39, der entsprechend einem Doppelpfeil 40 relativ zu den anderen Bereichen des Übertragungskörpers 13 in der Schallausbreitungsrichtung 22,23 positionierbar ist. Mit Hilfe der Verstellung des Abschnitts 39 kann das Volumen der zweiten Kammer 29 variiert werden. Auf diese Weise kann das Resonanzverhalten der zweiten Kammer 29 auf eine bestimmte Zielfrequenz bzw. ein bestimmtes Zielfrequenzband abgestimmt werden. Dieser Abstimmungsvorgang kann beispielsweise bei der Montage des Schallwandlers 12 am Fahrzeug erfolgen. Der Abschnitt 39 wird nach der Abstimmung fixiert und behält die einmal gefundene Einstellung bei. Bei den in Fig. 8 und 9 gezeigten besonderen Ausführungsformen ist der Abschnitt 39 mit Hilfe eines geeigneten Aktuators 41 im Betrieb des Schallwandlers 12 verstellbar, so daß das Resonanzverhalten der zweiten Kammer 29 und somit die Schallabstrahlcharakteristik bzw. das Modulationsverhalten des Schallwandlers 12 in Abhängigkeit von vorbestimmten Parametern veränderbar ist. Beispielsweise kann eine Steuerung den Aktuator 41 in Abhängigkeit der Drehzahl und/oder der Last der Brennkraftmaschine 1 betätigen.In the embodiments of Figs. 8 and 9, the transfer body has 13 in the region of the second chamber 29 a adjustable section 39, which corresponds to a double arrow 40 relative to the other areas of the transmission body 13 positionable in the sound propagation direction 22,23 is. With the help of the adjustment of section 39 For example, the volume of the second chamber 29 can be varied. On This way, the resonance behavior of the second chamber 29 to a specific target frequency or a specific target frequency band be matched. This voting process can for example, during assembly of the transducer 12 am Vehicle done. Section 39 will be after the vote fixes and retains the once found setting. at the particular embodiments shown in FIGS. 8 and 9 is the section 39 by means of a suitable actuator 41 adjustable during operation of the transducer 12, so that the resonance behavior the second chamber 29 and thus the Schallabstrahlcharakteristik or the modulation behavior of the Sound transducer 12 in response to predetermined parameters is changeable. For example, a controller can Actuator 41 as a function of the speed and / or the load of the internal combustion engine 1 actuate.

Während bei der Ausführungsform gemäß Fig. 8 der Abschnitt 39 auch den Ausgang 18 des Übertragungskörpers 13 aufweist, so daß dieser bei der Verstellung des Abschnitts 39 ebenfalls relativ zur Spritzwand 15 bewegt wird, ist der Abschnitt 39 bei der Ausführungsform gemäß Fig. 9 zwischen zwei ortsfesten Abschnitten des Übertragungskörpers 13 angeordnet, so daß insbesondere die Position des Ausgangs 18 auch bei einer Verstellung des Abschnitts 39 invariant ist.While in the embodiment of FIG. 8, the section 39 also has the output 18 of the transmission body 13, so that this in the adjustment of section 39 also is moved relative to the bulkhead 15, is the section 39 in the embodiment of FIG. 9 between arranged two stationary sections of the transfer body 13, so that in particular the position of the output 18 is also invariant with an adjustment of the section 39.

Während bei den bisher beschriebenen Ausführungsbeispielen die Halterung 20 des Schwingkörpers 19 stets als Faltenbalg 24 und als Wellrohr 25 beschrieben worden ist, sind grundsätzlich auch andere Ausführungsformen möglich, die einen Druckausgleich ohne Verspannung des Schwingkörpers 19 ermöglichen. Beispielhaft sind in den Fig. 10 und 11 daher andere Ausführungsformen dieser Halterung 20 dargestellt.While in the embodiments described so far the holder 20 of the vibrating body 19 always as a bellows 24 and has been described as corrugated tube 25 are basically Other embodiments possible, the one Allow pressure equalization without distortion of the vibrating body 19. By way of example, FIGS. 10 and 11 therefore differentiate Embodiments of this holder 20 shown.

Gemäß Fig. 10 kann die Halterung 20 z.B. durch einen Hohlzylinder 42 gebildet sein, an dem an einem axialen Ende der Schwingkörper 19 befestigt ist. Der Hohlzylinder 42 ist mittels einer Federung 43 mit dem Übertragungskörper 13 verbunden. Der Hohlzylinder 42,ist außerdem außen auf einen zylindrischen Abschnitt 44 des Übertragungskörpers 13 aufgesteckt, wobei die Dimensionierungen so aufeinander abgestimmt sind, daß der Hohlzylinder 20 im wesentlichen gasdicht und reibungsarm teleskopisch in der Schwingungsrichtung 21 am Abschnitt 44 gelagert ist. Die Federung 43 ermöglicht dabei einerseits den erforderlichen Druckausgleich und andererseits die translatorische Schwingungsbewegung des Schwingkörpers 19.According to Fig. 10, the holder 20 may be e.g. through a hollow cylinder 42 may be formed at the at one axial end of the Vibrating body 19 is attached. The hollow cylinder 42 is by means of a suspension 43 connected to the transfer body 13. The hollow cylinder 42, is also outside on a cylindrical Section 44 of the transmission body 13 attached, the dimensions are coordinated with each other are that the hollow cylinder 20 is substantially gas-tight and low-friction telescopic in the direction of vibration 21 is mounted on section 44. The suspension 43 allows on the one hand the required pressure compensation and on the other hand, the translatory oscillatory motion of Vibrating body 19.

Entsprechend Fig. 11 kann die als Hohlzylinder 42 ausgebildete Halterung 20 auch in einem zylindrischen Abschnitt 45 des Übertragungskörpers 13 eingesteckt und darin hubverstellbar gelagert sein, wobei auch hier die Dimensionierungen so aufeinander abgestimmt sind, daß der Hohlzylinder 42 im wesentlichen reibungsfrei und gasdicht im Zylinderabschnitt 45 gelagert ist. Hier sind der Hohlzylinder 42 und der Übertragungskörper 13 über die Federung 43 miteinander fest verbunden, wobei diese Federung beispielsweise durch eine Schraubenfeder gebildet sein kann.According to FIG. 11, the hollow cylinder 42 formed as Holder 20 also in a cylindrical portion 45th the transfer body 13 inserted and adjustable in stroke be stored, and here too the dimensions are coordinated so that the hollow cylinder 42nd essentially frictionless and gas-tight in the cylinder section 45 is stored. Here are the hollow cylinder 42 and the transmission body 13 via the suspension 43 with each other firmly connected, this suspension, for example, by a coil spring may be formed.

Claims (18)

  1. An acoustic transducer for a motor vehicle having the following features:
    a hollow transmission body (13) is connected at its input (17) to a sound source (1) in the motor vehicle so that it communicates for the purpose of output of airborne sound,
    modulated airborne sound can be emitted in or toward at least one target space (16) by the transmission body (13) at an outlet (18) of the transmission body (13),
    the transmission body (13) has a vibrating body (19) and is sealed airtight so that the input gas pressure (p1, p2) is applied to the vibrating body (19) on one side and the output gas pressure (p0) is applied to the other side,
    the vibrating body (19) can be excited to vibration by the output airborne sound whereby it generates modulated airborne sound and emits it at or to the output (18) of the transmission body (13),
    characterized by the following features:
    the vibrating body (19) is designed as a rigid and/or stiff body which is mounted so that it is capable of vibrating on a mount (20) parallel to the direction of sound propagation (22, 23) of the incoming and/or outgoing airborne sound,
    the mount (20) is situated in or on the transmission body (13) so that it is adjustable against a spring force in parallel with the direction of vibration (21) of the vibrating body (19).
  2. The acoustic transducer according to Claim 1,
    characterized in that
    the mount (20) is designed as a corrugated pipe (25) made of metal or as folded bellows (24) made of plastic or of rubber, having the vibrating body (19) at one end and being attached to the transmission body (13) at the other end.
  3. The acoustic transducer according to Claim 2,
    characterized in that
    the vibrating body (19) and the folded bellows (24) can be manufactured in one piece.
  4. The acoustic transducer according to Claim 3,
    characterized in that
    the vibrating body (19) and the folded bellows (24) are manufactured as blow molded parts or as injection molded parts or as molded cast parts.
  5. The acoustic transducer according to Claim 2,
    characterized in that
    the folded bellows (24) is integrally molded on the vibrating body (19) or the vibrating body (19) is integrally molded on the folded bellows (24).
  6. The acoustic transducer according to Claim 2,
    characterized in that
    the vibrating body (19) is made of a heat-resistant material, e.g., metal, glass, ceramic and is attached to the corrugated pipe (25).
  7. The acoustic transducer according to any one of Claims 2 through 6,
    characterized in that
    the corrugated pipe (25) or the folded bellows (24) is designed to be essentially cylindrical or conical.
  8. The acoustic transducer according to Claim 1,
    characterized in that
    the mount (20) has a hollow cylinder (42) on which the vibrating body (19) is attached on the one hand and which on the other hand is situated in or on a cylinder section (44, 45) of the transmission body (13) so that it is telescopically adjustable, whereby a spring mount (43) which acts on the hollow cylinder (42) and on the transmission body (13) is provided.
  9. The acoustic transducer according to any one of Claims 1 through 8,
    characterized in that
    the transmission body (13) has a line section (30) having an inlet (17) and developing via a sudden expansion in cross section (31) into a chamber (28), whereby the vibrating body (19) is situated at the inlet or outlet of the chamber (28) or between the inlet and outlet.
  10. The acoustic transducer according to Claim 9,
    characterized in that
    the line section (30) is designed as a λ/2 resonator or has a section designed as λ/2 resonator.
  11. The acoustic transducer according to Claim 9 or 10,
    characterized in that
    the chamber (28) with the integrated vibrating body (19) forms a module which can be acted upon in its interior by hot gases.
  12. The acoustic transducer according to any one of Claims 2 through 7, as well as one of Claims 9 through 11,
    characterized in that
    the corrugated pipe (25) or the folded bellows (24) is arranged essentially coaxially in the chamber (28) such that the vibrating body (19) is arranged opposite the inlet of the chamber (19) and flush with it.
  13. The acoustic transducer according to any one of Claims 1 through 12,
    characterized in that
    the outlet (18) of the transmission body (13) is designed as a sound-emitting funnel.
  14. The acoustic transducer according to any one of Claims 1 through 13,
    characterized in that
    the transmission body (13) has a chamber (29) which develops via a sudden reduction in cross section (33) into a line section (32) of the transmission body (13) having an outlet (18), whereby the vibrating body (19) is situated at the inlet or at the outlet of the chamber (29) or between the inlet and outlet.
  15. The acoustic transducer according to any one of Claims 9 through 14,
    characterized in that
    the transmission body (13) has an adjustable section (39) in the area of the one chamber (28) and/or in the area of the other chamber (29) whereby the volume of the one chamber (28) and/or the volume of the other chamber (29) is variable through an adjustment of the section (39).
  16. The acoustic transducer according to any one of Claims 1 through 15,
    characterized in that
    the sound source is formed by an internal combustion engine (1) of the vehicle whereby the transmission body (13) is connected to a fresh air line (2) leading to the internal combustion engine (1) or is connected to an exhaust gas line (9) that leads away from the internal combustion engine (1).
  17. The acoustic transducer according to any one of Claims 1 through 16,
    characterized in that
    the target space is an engine space (14) of the vehicle in which an internal combustion engine (1) of the vehicle is accommodated.
  18. The acoustic transducer according to any one of Claims 1 through 17,
    characterized in that
    the target space is an interior space (16) of the vehicle in which seats for vehicle passengers are situated.
EP03010875A 2002-05-15 2003-05-15 Acoustic transducer for motor vehicle Expired - Lifetime EP1365120B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10221447 2002-05-15
DE10221447A DE10221447A1 (en) 2002-05-15 2002-05-15 Sound transducer for a motor vehicle

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EP1365120A1 EP1365120A1 (en) 2003-11-26
EP1365120B1 true EP1365120B1 (en) 2004-06-16

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WO2006086950A1 (en) * 2005-02-16 2006-08-24 Woco Industrietechnik Gmbh Device for sonic coupling between an inlet tract and/or engine bay and a vehicle interior in a motor vehicle
DE102005006914B4 (en) * 2005-02-16 2008-05-29 Woco Industrietechnik Gmbh Device for sound coupling between an intake tract and / or engine compartment and a vehicle interior of a motor vehicle
US7487857B2 (en) 2005-02-16 2009-02-10 Woco Industrietchnik Gmbh Sonic coupling between an intake tract or engine compartment and the interior of a motor vehicle
DE102012109668A1 (en) 2012-10-11 2014-04-17 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Device for sound transmission in vehicle e.g. motor car, has transfer line that is provided with gastight membrane as sound transmission element to direct mouth region of exhaust system for connecting with inner space of motor car
EP3543498B1 (en) * 2018-03-20 2023-10-11 Purem GmbH Method for producing a silencer

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DE50300024D1 (en) 2004-07-22
EP1365120A1 (en) 2003-11-26
DE10221447A1 (en) 2003-11-27

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